Re: [Dtls-iot] Fwd: I-D Action: draft-mglt-dice-ipsec-for-application-payload-00.txt

Carsten Bormann <cabo@tzi.org> Thu, 24 July 2014 12:36 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Thu, 24 Jul 2014 08:35:50 -0400
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To: "Kumar, Sandeep" <sandeep.kumar@philips.com>
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Subject: Re: [Dtls-iot] Fwd: I-D Action: draft-mglt-dice-ipsec-for-application-payload-00.txt
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On 24 Jul 2014, at 07:04, Kumar, Sandeep <sandeep.kumar@philips.com> wrote:

> Just a quick question, since you are using AES-CCM, how do you ensure different nonces for the different senders in your scheme?

We haven’t said how the IV is built that RFC 4309 requires.  This could be done in a similar way draft-keoh-dice-multicast-security does this (e.g., starting with an 8-bit sender-ID).  Ensuring uniqueness of the sender-ID during the lifetime of the key of course is paramount.

Grüße, Carsten